How dolphins sleep?

They sleep on just one side of its brain at a time; the other half remains awake and controls breathing.

Right-Handed or Left-Handed

90% of all humans are right-handed. The 10% are left-handed.

In my crazy existence,
divorce comes before marriage,
children before parents,
death before life,
and Friday before Thursday.
What am I?

Answer: (highlight this line) *dictionary* (highlight this line)